Basic Information

1. ESD--which means Electro Static Discharge. This is what occurs when you walk across a carpet and touch a piece of metal and get a shock. Before touching the HQ sound board You should touch something that is grounded to discharge static electricity you may be storing. This is important to do with any bare electronic circuit boards you handle.

2. The DT-1 circuit boards can be installed at any trackside location with the sensors facing the track. In addition, the circuit board should be mounted on top of some type of shim so the sensors are above the track level in order to keep the infrared from reflecting off the track.  You can use velcro, double back tape. 
Caution, do not lay board down on any metallic surfaces or permanent damage will result.

3. Camouflage: When installation is complete, you can camouflage the DT-1 circuit board with bushes, etc.

4. Use indoors: These units are not designed for out door use. 

5. Specifications: Power requirements. 9 to 18 volts DC or 4 to 18 volts AC. Current Drain is approx. 60ma max.

Basic Connecting Configurations

DT-1 by track

Sound Module Activation when the train passes

LED Activation

You can light up an LED at any location you want to indicate where the train is.

Activate Grade Crossing 

Below shows basic connections for activating a grade crossing crossbucks.
Since there are 2 sets of relay contacts, You can also activate a grade crossing bell, such the ITTC HQ300 with the other set of contacts or any other event.

For a simple grade crossing you can use 1 DT-1 right at the grade crossing. 
If you want more prototypical grade crossing, you can put a DT-1 on each side of the track some distance from the actual crossing. This will be more accurate. You would then parallel all the wires from 1 DT-1 to another.

Auto Reversing the easy way